107 Piscium
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107 Piscium is a single<ref name=Halbwachs2018/> star in the constellation of Pisces. 107 Piscium is the star's Flamsteed designation. John Flamsteed numbered the stars of Pisces from 1 to 113, publishing his Catalogus Britannicus in 1725. He accidentally numbered 107 Piscium twice, as he also allocated it the designation of 2 Arietis.<ref name=jha18_3_209/> This star is faintly visible to the naked eye with an apparent visual magnitude that has been measured varying between 5.14 and 5.26.<ref name=nsv1 /> However, that finding of variation was not confirmed by subsequent observations and is most likely spurious data.<ref name=Lockwood1997/> It is located at a distance of about Template:Val away from the Sun.<ref name=GaiaDR2/> 107 Piscium is drifting closer to the Sun with a radial velocity of −33.6,<ref name=Soubiran2018/> and is predicted to come as close as Template:Convert in around 135,800 years.<ref name=Bailer2018/>
This object is a K-type main-sequence star with a stellar classification of K1V,<ref name=Keenan1989/> indicating it is generating energy from core hydrogen fusion. It is somewhat older than the Sun—approximately 6 billion years old.<ref name="MH08"/> The star has 86% of the mass and 82% of the radius of the Sun,<ref name=Fuhrmann2011/> but shines with only 46% of the Sun's luminosity.<ref name=takeda/> The effective temperature of the star is Template:Val.<ref name=Fuhrmann2011/> It is rotating slowly with a period of Template:Val.<ref name=aaa521_A12/> The abundance of elements other than hydrogen and helium—the star's metallicity—is slightly lower than that of the Sun.<ref name=geneva3/> The level of chromospheric activity is similar to the Sun, and it shows a simple cycle of variation.<ref name=Radick2018/><ref name=Wright2008/>
107 Piscium has been examined for the presence of an infrared excess caused by exozodiacal dust, but none was detected.<ref name="aaa555_A104"/> The habitable zone for this star, defined as the locations where liquid water could be present on an Earth-like planet, is at a radius of 0.52–Template:Val (AU), where Template:Val is the average distance from the Earth to the Sun.<ref name="aaa555_A104"/>
In 1997, based on data collected during the Hipparcos mission, the star was categorized as an astrometric binary with a period of Template:Val. However, this result has not been confirmed.<ref name="aaa574_A6"/>
See also
References
External links
- SolStation article on 107 Piscium.